In my opinion, inappropriately leaked information should probably still be considered private, even if it was made publicly accessible. But even if not, Singal says the same leaker directly contacted him with a new leak, which he also published.
The central complaint doesn't seem to be distaste, but rather the fact that he is uniquely privileged over other users, despite violating Bluesky's terms of service.[0]
The interface also allow to comment, post and interact with the original HN platform. Credentials are stored locally and are never sent to any server, you can check the source code here: https://github.com/GabrielePicco/hacker-news-rich.